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Processes for producing monolithic porous carbon disks from aromatic organic precursors

a technology of aromatic organic precursors and porous carbon disks, which is applied in the direction of cell components, electrochemical generators, transportation and packaging, etc., can solve the problems of monolithic rf carbon aerogel materials manufacturing cost, polymer precursor compressibility, and severely limited market potential of rf carbon aerogel as electrode and material for ultracapacitors and supercapacitors

Inactive Publication Date: 2006-02-16
ELECTROMATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] Still other objects and advantages of the invention will in part be obvious and will in part be apparent from the specification.

Problems solved by technology

Yet, the potential market of RF carbon aerogel as electrode and material for ultracapacitors and supercapacitors is severely limited by the low operating voltage of the capacitor (<=5V) and high manufacturing cost of monolithic RF carbon aerogel materials.
One is the compressibility of the polymer precursor and the other is the difficulty in retaining interpenetrating network of the pores during the compression process.
The compression of carbon powder under vacuum at 800° C. displays severe technical challenges and high manufacturing costs.
Although this approach has the merit of low cost by using inexpensive carbon black powder it has the difficulty in retaining open pores of synthetic resin, thus reducing the efficiency of pore surface area.

Method used

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  • Processes for producing monolithic porous carbon disks from aromatic organic precursors
  • Processes for producing monolithic porous carbon disks from aromatic organic precursors
  • Processes for producing monolithic porous carbon disks from aromatic organic precursors

Examples

Experimental program
Comparison scheme
Effect test

example 1

Synthesis of Polyimide Precursor with Three-Dimensional Molecular Structure and Carbon Disk Therefrom

[0088] Starting monomers: 3,3′4,4′-biphenyltetraamine (TAB), 1,2,4,5-benzenetetracarboxylic dianhydride (PMDA), and 1,4-phenylenediamine (PPD). [0089] Solvent: N,N-dimethylacetamide (DMAc).

[0090] 1.30 gram (0.012 mole) PPD was dissolved in 40 ml DMAc in a flask. While stirring, 3.270 gram (0.015 mole) PMDA in the solid form was added to the reaction system. After PMDA was fully dissolved, 0.3215 gram (0.0015 mole) TAB was added to the reaction system. The reaction was carried out at ambient temperature with mechanical stirring until a very viscous solution, often gel lumps, were formed. The temperature of the reaction was gradually raised to 150° C. with strong agitation to produce polyimide in precipitated powder form. The solvent was distilled off under vacuum at 50° C. The powders were further broken down and filtered through a 50 micron-sized sieve.

[0091] By using a hydraulic ...

example 2

Synthesis of Polyimide Prepolymer with Three-Dimensional Molecular Structure Doped with 1% Molybdenum by Weight and Carbon Disk Therefrom

[0092] Starting monomers and additive: 3,3′4,4′-biphenyltetraamine (TAB), 1,2,4,5-benzenetetracarboxylic dianhydride (PMDA), 1,4-phenylenediamine (PPD), and molybdenum chloride (V) (MoCl5). [0093] Solvent: N,N-dimethylacetamide (DMAc).

[0094] 1.30 gram (0.012 mole) PPD and 0.135 gram MoCl5 were dissolved in 40 ml DMAc in a flask. While stirring, 3.270 gram (0.015 mole) PMDA in the solid form was added to the reaction system. After PMDA was fully dissolved, 0.3215 gram (0.0015 mole) TAB was added to the reaction system. The reaction was carried out at ambient temperature with mechanical stirring until a very viscous solution, often gel lumps, were formed. The temperature of the reaction was gradually raised to 150° C. with strong agitation to produce polyimide / MoCl5 in precipitated powder form. The solvent was distilled off under vacuum at 50° C. T...

example 3

Synthesis of Polyimide Prepolymer Doped with 1% Molybdenum by Weight and Carbon Disk Therefrom

[0096] Starting monomers and additive: 1,2,4,5-benzenetetracarboxylic dianhydride (PMDA), 1,4-phenylenediamine (PPD), and molybdenum chloride (V) (MoCl5). [0097] Solvent: N,N-dimethylacetamide (DMAc).

[0098] 1.622 gram (0.015 mole) PPD and 0.135 gram MoCl5 were dissolved in 40 ml DMAc in a flask. While stirring, 3.270 gram (0.015 mole) PMDA in the solid form was added to the reaction system. The reaction was carried out at ambient temperature with stirring until a very viscous solution was formed. The reaction temperature was raised to 150° C. with strong agitation to produce polyimide / MoCl5 precipitate in precipitated powder form. The solvent was distilled off under vacuum at 50° C. The powders were further broken down and filtered through a 5-micron-sized sieve.

[0099] The polyimide powders were consolidated at 4500 psi pressure at ambient temperature to produce a monolith. Pyrolysis of ...

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Abstract

Disclosed are processes for producing monolithic and metal doped monolithic porous carbon disks from prepolymer organic precursors in the powder form composed of either or both polyimide and polybenzimidazole. The powders are consolidated (compressed) into disks and then pyrolyzed to form the desired porous carbon disk. Porous carbon-carbon composite disks are also prepared by adding carbon to the prepolymer organic precursors.

Description

[0001] This is a continuation-in-part of U.S. application Ser. No. 10 / 919,450, filed Aug. 16, 2004.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to the preparation of precursors composed of either or both polyimide and polybenzimidazole as organic precursors for producing monolithic porous carbon with density less than or equal to 1.0 g / cc; and the processes for producing monolithic porous carbon from either or both polyimide and polybenzimidazole precursors in the powder form. The present invention further relates to the processes for producing monolithic porous carbon derived from either or both polyimide and polybenzimidazole precursors having one or more than one metals dispersed therein. The present invention even further relates to the processes for producing carbon-carbon composite prepared from precursors comprising either or both polyimide and polybenzimidazole and activated carbon in the form of powders and / or fibers. [00...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C01B31/00
CPCB82Y30/00C04B35/524C04B2235/3256C04B2235/40C04B2235/404C04B2235/80H01G9/042H01M4/0471H01M4/583H01M4/621H01M4/622H01M4/625H01M4/626H01M4/8875H01M4/8882H01M4/9083H01M4/926H01M4/96H01M8/0234H01G11/24H01G11/32Y10T428/21Y02E60/50Y02E60/10Y02E60/13
Inventor WANG, JING
Owner ELECTROMATERIALS
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